[Qemu-block] [SeaBIOS] [PATCH 4/5] config: Add toggle for bootdevice information

[Sam Eiderman]

Add the "BOOTDEVICES" toggle to remove boot device information received
through fw_cfg.

We will use this toggle in QEMU to reduce the size of the 128k SeaBIOS
rom, which is only used in old compat versions, where this boot device
information does not exist.

Reviewed-by: Karl Heubaum <address@hidden>
Reviewed-by: Arbel Moshe <address@hidden>
Signed-off-by: Sam Eiderman <address@hidden>
---
 src/Kconfig | 7 +++++++
 src/boot.c  | 9 +++++++++
 2 files changed, 16 insertions(+)

diff --git a/src/Kconfig b/src/Kconfig
index 55a87cb7..b3645b33 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -72,6 +72,13 @@ endchoice
         help
             Support controlling of the boot order via the fw_cfg/CBFS
             "bootorder" file.
+    config BOOTDEVICES
+        depends on BOOT
+        bool "Boot device information"
+        default y
+        help
+            Support boot device information via the fw_cfg/CBFS
+            "bootdevices" file.
 
     config COREBOOT_FLASH
         depends on COREBOOT
diff --git a/src/boot.c b/src/boot.c
index 9248fab9..e89b9238 100644
--- a/src/boot.c
+++ b/src/boot.c
@@ -95,6 +95,9 @@ static int BootDeviceCount;
 static void
 loadBootDevices(void)
 {
+    if (!CONFIG_BOOTDEVICES)
+        return;
+
     BootDeviceCount = 0;
     int fsize;
     char *f = romfile_loadfile("bootdevices", &fsize);
@@ -172,6 +175,8 @@ bootdevice_find(const char *glob)
 static BootDevice *
 bootdevice_find_pci_device(struct pci_device *pci)
 {
+    if (!CONFIG_BOOTDEVICES)
+        return NULL;
     // Find pci device - for example: /pci@i0cf8/ethernet@5
     char desc[256];
     build_pci_path(desc, sizeof(desc), "*", pci);
@@ -181,6 +186,8 @@ bootdevice_find_pci_device(struct pci_device *pci)
 static BootDevice *
 bootdevice_find_scsi_device(struct pci_device *pci, int target, int lun)
 {
+    if (!CONFIG_BOOTDEVICES)
+        return NULL;
     if (!pci)
         // support only pci machine for now
         return NULL;
@@ -194,6 +201,8 @@ bootdevice_find_scsi_device(struct pci_device *pci, int 
target, int lun)
 static BootDevice *
 bootdevice_find_ata_device(struct pci_device *pci, int chanid, int slave)
 {
+    if (!CONFIG_BOOTDEVICES)
+        return NULL;
     if (!pci)
         // support only pci machine for now
         return NULL;
-- 
2.13.3